Communications D - 17
Error Codes
The following table shows Modbus communication error codes.
Slave Not Responding
In the following cases, the slave will ignore the write function.
• When a communication error (overrun, framing, parity, or CRC-16) is detected in the command message.
• When the slave address in the command message and the slave address in the Drive do not agree.
• When the data that configures the message and the data time length exceed 24 bits.
• When the command message data length is invalid.
Table D.8 Error Codes
Error
Code
Contents
01H
Function code error
A function code other than 03H, 08H, or 10H has been set by the master.
02H
Invalid register number error
• The register address you are attempting to access is not recorded anywhere.
• With broadcast sending, a start address other than 0000H, 0001H, or 0002H has been set.
03H
Invalid quantity error
• The number of data packets being read or written is outside the range of 1 to 16.
• In write mode, the number of data packets in the message is not No. of packets x 2.
21H
Data setting error
• Upper limit or lower limit error has occurred in the control data or when writing parameters.
• When writing parameters, the parameter setting is invalid.
22H
Write mode error
• Attempting to write parameters to the Drive during run.
• Attempting to write via Enter commands during run.
• Attempting to write parameters other than A1-00 to A1-05, E1-03, or 02-04 when a
CPF03 (defective EEPROM) fault has occurred.
• Attempting to write read-only data.
23H
Writing during main circuit undervoltage (UV) fault
• Writing parameters to the Drive during UV (main circuit undervoltage) alarm.
• Writing via Enter commands during UV (main circuit undervoltage) alarm.
24H
Writing error during parameters processing
Attempting to write parameters while processing parameters in the Drive.
IMPORTANT
If the slave address specified in the command message is 0, all slaves execute the write function, but do not
return response messages to the master.
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